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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I have one website http://www.siloamsprings.com that will not load on either my OpenSuse or Kubuntu systems, using either Konqueror or Firefox. This website loads ok on windows systems with either IE or Firefox. I don't seem to have any problems loading any other websites.

Both Linux systems are running KDE4 and are the latest releases. I don't have a KDE3 system to test with.

Have you looked at your server log files to see what problems are reported? I would start with your /var/log/apache2/access.log and /var/log/apache2/error.log.
If you don't see any problem there look in your /var/log/apache2/error.log.siloamsprings and /var/log/apache2/access.log.siloamsprings files.

I don't own this website, the city of Siloam Springs does and when I called about the problem the IT guy denied they had a problem. Seems to think it is somethink wrong with Linux. I just want to use my linux systems to get to this site.

My name is Christopher M. Hobbs, I'm the Network Administrator for the City of Siloam Springs a member of the openSUSE Community and a member of the openSUSE-GNOME team.

The issue posted here is a known issue and has nothing to do with our webserver. The problem we're having is with our firewall and it has been on the table for some months now. The firewall will soon be replaced, so in order to fix things on your end (at least until we have a new firewall), you will need to adjust your TCP Window Scaling options.

In order to do this temporarily, you can issue the following command (as root):

sysctl -w net.ipv4.tcp_window_scaling=0

Should that command fail, give this one a shot:

echo 0 > /proc/sys/net/ipv4/tcp_window_scaling

To permanently disable TCP Window Scaling, issue the following command as root and reboot:

echo '"net.ipv4.tcp_window_scaling=0" >> sysctl.conf'

I'll personally write the original author of this post from my City account should he not return to this thread.

Being at work right now and having just got the thread update notification it occurred to me to try visiting the site from my work machine which runs SUSE Linux Enterprise Desktop 10. The site loads fine even though tcp_window_scaling is not 0

Code:

me@mymachine:~> cat /proc/sys/net/ipv4/tcp_window_scaling
1

On an openSUSE 11.1 machine I also have at work for tinkering with the website fails to load just as it does on my openSUSE 11.1 machine at home. Interestingly, the tcp_window_scaling setting is the same as on my SLED 10 machine:

Code:

host-foo:~ # cat /proc/sys/net/ipv4/tcp_window_scaling
1

If I change the tcp_windows_scaling to 0 then the website loads. Which is curious.

Being at work right now and having just got the thread update notification it occurred to me to try visiting the site from my work machine which runs SUSE Linux Enterprise Desktop 10. The site loads fine even though tcp_window_scaling is not 0

Code:

me@mymachine:~> cat /proc/sys/net/ipv4/tcp_window_scaling
1

On an openSUSE 11.1 machine I also have at work for tinkering with the website fails to load just as it does on my openSUSE 11.1 machine at home. Interestingly, the tcp_window_scaling setting is the same as on my SLED 10 machine:

Code:

host-foo:~ # cat /proc/sys/net/ipv4/tcp_window_scaling
1

If I change the tcp_windows_scaling to 0 then the website loads. Which is curious.

Anyway, best get back to work.

For what it's worth, I've had the same problem with almost all modern Linux distros. I'm probably the first to have noticed it being that the site belongs to my employer and I couldn't access our intranet.

Older distros (such as SLED 10, which I do use at the office) work without modification. I don't know the intimate details of it, I just know that our firewall is awful picky about window scaling.

With (currently) 5 posts & 3 "Thanks" (= 60% "Thanked"!!!) you should probably qualify for "LQ Saint" status rather than "LQ Newbie". [ I am taking the pi?? - I hate this Thumbs-Up button, but it was only recently introduced ]